1. LONG LASTING MATERIALS Made of solid mild steel and tempered for hardness, this high quality material will be resilient for years of use. The rubber block is another great surface to hammer on as it is thick and durable. Simply turn it upside down and use! 2. MULTI-USE BLOCK This block can be used for so many things, it’s almost mind boggling! For the jewelry maker and repairer, this item is essential. Whether you’re working with brass, silver or aluminum, this steel block should provide you with a perfect surface. Great for flattening and shaping various types of metal while not having to worry about damaging your desk surface. 3. RUBBER BASE IS SHOCK ABSORBANT The steel block fits snugly in the rubber base and has a semi circle cut out which allows for easy separation of blocks. The rubber base absorbs the shock as your hammer your piece. This makes it much easier on the hands. It’s almost like walking on anti-fatigue mats but this one is for your hands. If you need to remove the steel block from the rubber base, that is also very easy to do and place back again when done. The rubber base also prevents nasty rebounds, making it a more pleasurable experience while working 4. THE PERFECT SIZE Rubber Block 4-1/8" x 4-1/8" x 1-1/8" | Steel Block 3-13/16" x 3-13/16 x 11/16" | This makes the block extremely compact and thus won’t take up significant space on your work bench.